20618935619 has 2 divisors, whose sum is σ = 20618935620. Its totient is φ = 20618935618.

The previous prime is 20618935609. The next prime is 20618935621. The reversal of 20618935619 is 91653981602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20618935619 - 2¹² = 20618931523 is a prime.

It is a super-2 number, since 2×20618935619² (a number of 21 digits) contains 22 as substring.

Together with 20618935621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20618935609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10309467809 + 10309467810.

It is an arithmetic number, because the mean of its divisors is an integer number (10309467810).

Almost surely, 2^20618935619 is an apocalyptic number.

20618935619 is a deficient number, since it is larger than the sum of its proper divisors (1).

20618935619 is an equidigital number, since it uses as much as digits as its factorization.

20618935619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 20618935619 in words is "twenty billion, six hundred eighteen million, nine hundred thirty-five thousand, six hundred nineteen".